The video on YouTube and Mr. Avidor’s video blog, was picked up by other bloggers and eventually, The Star Tribune, the daily newspaper in Minneapolis. Ms. Bachmann’s opponents did everything they could to circulate the video and put her in a position of explaining God’s unpaid consulting role in her campaign.People in the elections business often say that the most powerful form of endorsement, next to meeting and being actually impressed by a candidate, is the recommendation of a trusted friend.

IN this election, YouTube, with its extant social networks and the ability to forward a video clip and a comment with a flick of the mouse, has become a source of viral work-of-mouth. As a result, a disruptive technology that was supposed to upend a half-century-old distribution model of television is having a fairly disruptive effect on politics as well.